In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Palladium Nanoparticles in Water: A Reusable Catalytic System for the Cycloetherification or Benzannulation of α-Allenols, published in 2016, which mentions a compound: 21778-81-4, Name is 5-Methoxy-1H-indole-2-carbaldehyde, Molecular C10H9NO2, HPLC of Formula: 21778-81-4.
A convenient ligand-free catalytic system has been developed for the chemoselective cyclization reaction of various α-allenol derivatives by palladium nanoparticles (PdNPs) in an aqueous reaction medium.
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Reference:
Pyridazine – Wikipedia,
Pyridazine | C4H4N2 – PubChem